/* =====================================================================
   E-Building — Exploded View
   Layout: a drawing sheet. Cream drafting paper with navy ink; the hero is
   a live axonometric that explodes on scroll; the form is a title block.
   Single deliberate look (paper + ink) in every theme.
   ===================================================================== */
:root{
  --paper:#F7F3EC;        /* drafting paper (brand cream) */
  --paper-2:#EFE8DC;      /* shaded paper */
  --ink:#0E1A2E;          /* brand navy, line work + text */
  --ink-2:#294054;        /* secondary navy */
  --ink-soft:#5C6B7D;     /* muted annotation */
  --gold:#CBA560;         /* brand gold */
  --gold-deep:#A98942;    /* gold on paper (AA for large text) */
  --gold-hi:#E8C988;
  --rule:rgba(14,26,46,.16);
  --rule-strong:rgba(14,26,46,.38);
  --ok:#2F6B4F; --err:#A3352B;
  --cream:#F7F3EC; --navy:#0E1A2E;            /* fixed brand colours (do not flip) */
  --head-bg:rgba(247,243,236,.86);
  --label-bg:rgba(247,243,236,.94);
  --grid-a:rgba(14,26,46,.05); --grid-b:rgba(14,26,46,.025);
  --band-bg:#0E1A2E; --band-fg:#E8C988;
  --join-bg:#0E1A2E;
  --shadow:0 10px 30px -12px rgba(14,26,46,.28);

  --f-display:"Archivo","Arial Narrow",Arial,sans-serif;
  --f-body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;

  --gutter:clamp(16px,4vw,56px);
  --maxw:1240px;
  --head-h:64px;
  color-scheme:light;
}
/* blueprint (dark) theme */
html[data-theme=dark]{
  --paper:#0E1A2E; --paper-2:#14253D;
  --ink:#EDE6D8; --ink-2:#BFC9D6; --ink-soft:#8C9AAE;
  --gold-deep:#D9B872;
  --rule:rgba(237,230,216,.13); --rule-strong:rgba(237,230,216,.32);
  --ok:#5FB38A;
  --head-bg:rgba(14,26,46,.84);
  --label-bg:rgba(14,26,46,.92);
  --grid-a:rgba(140,180,230,.07); --grid-b:rgba(140,180,230,.035);
  --band-bg:#CBA560; --band-fg:#0E1A2E;
  --join-bg:#08111F;
  --shadow:0 12px 34px -12px rgba(0,0,0,.6);
  color-scheme:dark;
}
html[lang=ar]{
  --f-display:"Alexandria","IBM Plex Sans Arabic",Tahoma,sans-serif;
  --f-body:"IBM Plex Sans Arabic",Tahoma,"Segoe UI",sans-serif;
  --f-mono:"IBM Plex Sans Arabic","IBM Plex Mono",Tahoma,sans-serif;
}
html[lang=zh-Hans]{
  --f-display:"Archivo","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --f-body:"IBM Plex Sans","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --f-mono:"IBM Plex Mono","Noto Sans SC",ui-monospace,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--head-h) + 12px)}
body{
  margin:0;background-color:var(--paper);color:var(--ink);
  font-family:var(--f-body);font-size:17px;line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  /* drafting grid: 24px minor, 120px major */
  background-image:
    linear-gradient(var(--grid-a) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-a) 1px,transparent 1px),
    linear-gradient(var(--grid-b) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-b) 1px,transparent 1px);
  background-size:120px 120px,120px 120px,24px 24px,24px 24px;
  overflow-x:hidden;
}
html[lang=ar] body{line-height:1.9;font-size:17.5px}
html[lang=zh-Hans] body{line-height:1.85;font-size:16.5px}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
:focus-visible{outline:2px solid var(--gold-deep);outline-offset:3px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;inset-inline-start:12px;top:-60px;z-index:100;background:var(--navy);color:var(--cream);padding:10px 14px;text-decoration:none;font-weight:600}
.skip:focus{top:12px}
bdi{unicode-bidi:isolate;white-space:nowrap}

/* ---------- type ---------- */
.eyebrow{
  font-family:var(--f-mono);font-size:12px;font-weight:500;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-2);display:flex;align-items:center;gap:12px;margin:0 0 18px;
}
.eyebrow::before{content:"";width:28px;height:1px;background:currentColor}
html[lang=ar] .eyebrow,html[lang=zh-Hans] .eyebrow{letter-spacing:.02em;text-transform:none;font-size:14px}
h1,h2,h3{font-family:var(--f-display);margin:0;text-wrap:balance;color:var(--ink)}
h1{font-size:clamp(42px,6.2vw,92px);line-height:.96;font-weight:800;font-stretch:112%;letter-spacing:-.015em}
h2{font-size:clamp(30px,3.9vw,54px);line-height:1.04;font-weight:800;font-stretch:108%;letter-spacing:-.01em}
h3{font-size:clamp(19px,1.6vw,23px);line-height:1.2;font-weight:700;font-stretch:104%}
html[lang=ar] h1{font-size:clamp(38px,5.4vw,80px);line-height:1.22;letter-spacing:0;font-weight:800}
html[lang=ar] h2{font-size:clamp(28px,3.4vw,48px);line-height:1.3;letter-spacing:0}
html[lang=ar] h3{line-height:1.45}
html[lang=zh-Hans] h1{font-size:clamp(38px,5.6vw,84px);line-height:1.14;letter-spacing:.01em;font-weight:900}
html[lang=zh-Hans] h2{font-size:clamp(28px,3.4vw,48px);line-height:1.25;letter-spacing:.01em;font-weight:900}
.gold{color:var(--gold-deep)}
.lede{font-size:clamp(17px,1.35vw,20px);color:var(--ink-2);max-width:56ch;margin:0}

/* ---------- buttons ---------- */
.btn{
  --cut:10px;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;
  padding:0 24px;font:600 15px/1 var(--f-body);text-decoration:none;cursor:pointer;border:0;
  background:var(--ink);color:var(--paper);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
  transition:background .2s,transform .2s;
}
.btn:hover{background:var(--ink-2)}
.btn:active{transform:translateY(1px)}
.btn.gold-btn{background:var(--gold);color:var(--navy)}
.btn.gold-btn:hover{background:var(--gold-hi)}
.btn.line{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn.line:hover{background:rgba(14,26,46,.06)}
.btn .arr{display:inline-block;transition:transform .2s}
.btn:hover .arr{transform:translateX(4px)}
[dir=rtl] .btn .arr{transform:scaleX(-1)}
[dir=rtl] .btn:hover .arr{transform:scaleX(-1) translateX(4px)}

/* ---------- header ---------- */
.site-head{
  position:fixed;inset-inline:0;top:0;z-index:50;height:calc(var(--head-h) + env(safe-area-inset-top,0px));
  padding-top:env(safe-area-inset-top,0px);
  background:var(--head-bg);backdrop-filter:saturate(1.2) blur(10px);-webkit-backdrop-filter:saturate(1.2) blur(10px);
  border-bottom:1px solid var(--rule);transition:box-shadow .25s,background .25s;
}
.site-head.scrolled{box-shadow:var(--shadow)}
.head-in{height:var(--head-h);max-width:calc(var(--maxw) + 2*var(--gutter));margin:0 auto;padding-inline:var(--gutter);display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;flex:0 0 auto}
.brand img{height:30px;width:auto}
.logo-d{display:none!important}
html[data-theme=dark] .logo-l{display:none!important}
html[data-theme=dark] .logo-d{display:block!important}
.nav{display:flex;gap:24px;margin-inline-start:auto}
.nav a{font-size:14px;font-weight:500;text-decoration:none;color:var(--ink-2);padding:6px 0;border-bottom:1.5px solid transparent}
.nav a:hover,.nav a[aria-current]{color:var(--ink);border-color:var(--gold)}
/* header tools: one language button, theme toggle, CTA, mobile menu */
.tools{display:flex;align-items:center;gap:8px;margin-inline-start:auto}
.nav + .tools{margin-inline-start:18px}
.lang-menu,.mnav{position:relative}
.lang-menu summary,.mnav summary,.theme-btn{
  list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:7px;height:40px;padding:0 11px;
  border:1px solid var(--rule-strong);background:transparent;color:var(--ink);font:500 14px/1 var(--f-body);border-radius:0;
  transition:background .2s,border-color .2s;
}
.lang-menu summary::-webkit-details-marker,.mnav summary::-webkit-details-marker{display:none}
.lang-menu summary:hover,.mnav summary:hover,.theme-btn:hover{background:rgba(127,140,160,.12);border-color:var(--ink-2)}
.lang-menu svg,.theme-btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.lang-menu .chev{width:14px;height:14px;transition:transform .2s}
.lang-menu[open] .chev{transform:rotate(180deg)}
.lang-menu .cur{font-weight:600}
.lang-list{position:absolute;top:calc(100% + 6px);inset-inline-end:0;min-width:180px;margin:0;padding:6px;list-style:none;
  background:var(--paper);border:1px solid var(--rule-strong);box-shadow:var(--shadow);z-index:60}
.lang-list a{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:10px 12px;text-decoration:none;color:var(--ink);font-size:15px}
.lang-list a:hover{background:rgba(127,140,160,.12)}
.lang-list a[aria-current]{background:var(--ink);color:var(--paper)}
.lang-list .cd{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.1em;opacity:.7}
.lang-list a[lang=ar]{font-family:"IBM Plex Sans Arabic",Tahoma,sans-serif}
.lang-list a[lang=zh-Hans]{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif}
.theme-btn{width:40px;justify-content:center;padding:0}
.theme-btn .i-sun{display:none}
html[data-theme=dark] .theme-btn .i-sun{display:block}
html[data-theme=dark] .theme-btn .i-moon{display:none}
.mnav{display:none}
.mnav summary{width:40px;justify-content:center;padding:0}
.bars{display:grid;gap:4px;width:18px}
.bars i{display:block;height:1.6px;background:currentColor;transition:transform .25s,opacity .25s}
.mnav[open] .bars i:nth-child(1){transform:translateY(5.6px) rotate(45deg)}
.mnav[open] .bars i:nth-child(2){opacity:0}
.mnav[open] .bars i:nth-child(3){transform:translateY(-5.6px) rotate(-45deg)}
.mnav-panel{position:fixed;top:calc(var(--head-h) + env(safe-area-inset-top,0px));inset-inline:0;background:var(--paper);border-bottom:1px solid var(--rule-strong);
  box-shadow:var(--shadow);padding:10px var(--gutter) 22px;display:grid;gap:2px}
.mnav-panel a:not(.btn){padding:14px 0;border-bottom:1px solid var(--rule);text-decoration:none;font-family:var(--f-display);font-weight:700;font-size:20px}
.mnav-panel .btn{margin-top:14px}
@media (max-width:980px){ .nav{display:none} .mnav{display:block} }
@media (max-width:420px){ .lang-menu .cur{display:none} }
@media (max-width:560px){ .head-cta{display:none} .brand img{height:24px} .head-in{gap:10px} .tools{gap:6px} }

/* ---------- stage: hero + exploded view share one sticky drawing ---------- */
.stage-wrap{position:relative;height:calc(100svh + 340svh)}
.stage{position:sticky;top:0;height:100svh;overflow:hidden}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
#axo-lead{pointer-events:none}
.sheet-frame{position:absolute;inset:calc(var(--head-h) + 14px) 14px 14px;border:1px solid var(--rule-strong);pointer-events:none}
.sheet-frame::before{content:"";position:absolute;inset:6px;border:1px solid var(--rule)}
.title-block{
  position:absolute;inset-inline-end:14px;bottom:14px;display:grid;grid-template-columns:auto auto;
  font-family:var(--f-mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2);
  background:var(--paper);border:1px solid var(--rule-strong);pointer-events:none;
}
.title-block span{padding:6px 10px;border-inline-start:1px solid var(--rule);border-top:1px solid var(--rule)}
.title-block span:nth-child(-n+2){border-top:0}
.title-block span:nth-child(odd){border-inline-start:0}
html[lang=ar] .title-block,html[lang=zh-Hans] .title-block{letter-spacing:0;text-transform:none;font-size:11.5px}
@media (max-width:760px){ .title-block{display:none} .sheet-frame{inset:calc(var(--head-h) + 8px) 8px 8px} }

.hero{position:absolute;top:0;inset-inline:0;height:100svh;display:flex;align-items:center;pointer-events:none;z-index:3}
.hero-in{width:100%;max-width:calc(var(--maxw) + 2*var(--gutter));margin:0 auto;padding-inline:var(--gutter);padding-top:var(--head-h)}
.hero-copy{max-width:min(620px,52%);pointer-events:auto}
.hero h1 .l{display:block}
.hero .lede{margin-top:26px}
.hero-status{display:inline-flex;align-items:center;gap:10px;margin-top:22px;font-size:14.5px;font-weight:600;color:var(--ink)}
.hero-status i{width:9px;height:9px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px rgba(47,107,79,.15)}
.hero-ctas{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.hero-note{margin:14px 0 0;font-size:13.5px;color:var(--ink-soft)}
.hero-copy > *{opacity:1}
.js .hero-copy.intro > *{opacity:0;transform:translateY(14px)}
.js .hero-copy.intro.go > *{opacity:1;transform:none;transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
.js .hero-copy.intro.go > *:nth-child(2){transition-delay:.08s}
.js .hero-copy.intro.go > *:nth-child(3){transition-delay:.16s}
.js .hero-copy.intro.go > *:nth-child(4){transition-delay:.24s}
.js .hero-copy.intro.go > *:nth-child(5){transition-delay:.32s}
.js .hero-copy.intro.go > *:nth-child(6){transition-delay:.40s}
@media (max-width:760px){
  .hero{align-items:flex-start}
  .hero-in{padding-top:calc(var(--head-h) + 26px)}
  .hero-copy{max-width:100%}
  .hero .lede{font-size:16px;margin-top:16px}
  .hero-status{margin-top:14px;font-size:13.5px}
  .hero-ctas .btn{flex:1 1 150px;min-height:48px;padding:0 14px}
}

.scroll-hint{
  position:absolute;bottom:22px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:8px;white-space:nowrap;
  font-family:var(--f-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-2);pointer-events:none;
}
.scroll-hint::before{content:"";width:1px;height:36px;background:linear-gradient(var(--ink),transparent);animation:hint 1.8s ease-in-out infinite}
@keyframes hint{0%{transform:scaleY(.2);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}100%{transform:scaleY(.2);transform-origin:bottom}}
html[lang=ar] .scroll-hint,html[lang=zh-Hans] .scroll-hint{letter-spacing:0;text-transform:none;font-size:13px}

/* exploded-view copy and the layer callouts */
.ex-copy{position:absolute;top:calc(var(--head-h) + 40px);inset-inline-start:calc(var(--gutter) + 8px);max-width:min(400px,29vw);z-index:2}
.ex-copy p{margin:12px 0 0;color:var(--ink-2)}
.js .ex-copy{opacity:0}
.layers{list-style:none;margin:0;padding:0;counter-reset:layer}
.layers li{counter-increment:layer}
.layers .ln{font-family:var(--f-display);font-weight:700;font-size:17px;line-height:1.2;display:flex;align-items:baseline;gap:8px}
.layers .ln::before{content:counter(layer,decimal-leading-zero);font-family:var(--f-mono);font-size:11px;font-weight:500;color:var(--gold-deep)}
.layers .lc{font-size:13.5px;color:var(--ink-2);line-height:1.45;margin-top:3px}
/* JS mode: callouts are positioned next to the drawing */
.js .stage .layers{position:absolute;inset:0;pointer-events:none;z-index:2}
.js .stage .layers li{position:absolute;top:0;left:0;width:250px;opacity:0;transition:opacity .35s ease,box-shadow .3s,background .3s;
  background:var(--label-bg);padding:9px 12px;border-inline-start:2px solid var(--gold)}
.js .stage .layers li.on{opacity:1;pointer-events:auto;cursor:default}
.js .stage .layers li.focus{box-shadow:var(--shadow);border-inline-start-width:4px}
.js .stage .layers li.focus .ln{color:var(--gold-deep)}
@media (max-width:760px){
  .ex-copy{max-width:none;inset-inline-end:var(--gutter);top:calc(var(--head-h) + 22px)}
  .ex-copy h2{font-size:26px}
  .ex-copy p{font-size:14.5px}
  .js .stage .layers{inset:auto 10px 12px 10px;display:grid;grid-template-columns:1fr 1fr;gap:6px}
  .js .stage .layers li{position:static;width:auto;transform:none!important;padding:6px 8px}
  .layers .ln{font-size:14px}
  .layers .lc{font-size:12px}
}
@media (max-width:760px) and (max-height:740px){
  .hero h1{font-size:34px} html[lang=ar] .hero h1{font-size:32px} html[lang=zh-Hans] .hero h1{font-size:32px}
  .hero .lede{font-size:15px;line-height:1.55} .hero-note{display:none}
  .layers .lc{display:none}
  .ex-copy h2{font-size:23px}
}
/* no-JS fallback: the stage collapses to a readable list */
.no-js .stage-wrap{height:auto}
.no-js .stage{position:relative;height:auto;overflow:visible;padding:10px var(--gutter) 40px}
.no-js .stage canvas,.no-js .sheet-frame,.no-js .title-block,.no-js .scroll-hint{display:none}
.no-js .hero{position:relative;height:auto;padding:calc(var(--head-h) + 40px) 0 10px}
.no-js .hero-copy{max-width:640px}
.no-js .ex-copy{position:static;max-width:none;margin:30px 0}
.no-js .layers{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px}

/* ---------- generic sections ---------- */
.sec{padding-block:clamp(72px,10vw,140px);position:relative}
.wrap{max-width:calc(var(--maxw) + 2*var(--gutter));margin:0 auto;padding-inline:var(--gutter)}
.sec-head{display:grid;gap:16px;max-width:760px;margin-bottom:clamp(36px,5vw,64px)}

/* what changes */
.compare{display:grid;grid-template-columns:1fr 1fr;border-top:1.5px solid var(--ink)}
.compare > div{padding:26px 0 0;min-width:0}
.compare > div + div{border-inline-start:1px solid var(--rule);padding-inline-start:clamp(18px,3vw,40px)}
.compare > div:first-child{padding-inline-end:clamp(18px,3vw,40px)}
.compare h3{font-family:var(--f-mono);font-size:12px;font-weight:500;letter-spacing:.14em;text-transform:uppercase;margin-bottom:12px;color:var(--ink-soft)}
html[lang=ar] .compare h3,html[lang=zh-Hans] .compare h3{letter-spacing:0;text-transform:none;font-size:14px}
.compare .with h3{color:var(--gold-deep)}
.compare ul{list-style:none;margin:0;padding:0}
.compare li{display:flex;gap:14px;align-items:flex-start;padding:16px 0;border-bottom:1px solid var(--rule);font-size:clamp(16px,1.3vw,19px)}
.compare .today li{color:var(--ink-soft)}
.compare li::before{content:"";flex:0 0 auto;width:10px;height:10px;margin-top:.55em}
.compare .today li::before{border:1.5px solid var(--ink-soft);transform:rotate(45deg) scale(.85)}
.compare .with li::before{background:var(--gold);transform:rotate(45deg)}
.compare .with li{color:var(--ink);font-weight:500}
@media (max-width:760px){
  .compare{grid-template-columns:1fr}
  .compare > div + div{border-inline-start:0;padding-inline-start:0;margin-top:28px;border-top:1.5px solid var(--gold)}
  .compare > div:first-child{padding-inline-end:0}
}

/* how it works — tabs */
.tabs{display:flex;gap:0;border-bottom:1.5px solid var(--ink);overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tab{appearance:none;border:0;background:none;padding:14px 20px 12px;font:600 15px/1.3 var(--f-body);color:var(--ink-soft);cursor:pointer;white-space:nowrap;border-bottom:3px solid transparent;margin-bottom:-1.5px}
.tab[aria-selected=true]{color:var(--ink);border-color:var(--gold)}
.tab:hover{color:var(--ink)}
.panel{display:grid;grid-template-columns:1.25fr 1fr;gap:clamp(24px,5vw,72px);padding-top:clamp(28px,4vw,48px)}
.panel[hidden]{display:none}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:0}
.steps li{display:grid;grid-template-columns:64px 1fr;gap:16px;align-items:baseline;padding:22px 0;border-bottom:1px solid var(--rule)}
.steps li:first-child{border-top:1px solid var(--rule)}
.steps .n{font-family:var(--f-display);font-weight:800;font-size:40px;line-height:1;color:var(--gold-deep);font-variant-numeric:tabular-nums}
.steps .s{font-size:clamp(18px,1.5vw,21px);font-weight:600;line-height:1.35}
.steps .k{display:block;font-family:var(--f-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:4px}
html[lang=ar] .steps .k,html[lang=zh-Hans] .steps .k{letter-spacing:0;text-transform:none;font-size:12.5px}
.points{list-style:none;margin:0;padding:22px 24px;background:var(--paper-2);border:1px solid var(--rule);align-self:start;display:grid;gap:14px}
.points li{display:flex;gap:12px;font-size:16px}
.points li::before{content:"";flex:0 0 auto;width:14px;height:8px;margin-top:.5em;border-inline-start:2px solid var(--ok);border-bottom:2px solid var(--ok);transform:rotate(-45deg)}
[dir=rtl] .points li::before{transform:rotate(45deg) scaleX(-1)}
@media (max-width:860px){ .panel{grid-template-columns:1fr} }
@media (max-width:560px){ .tab{white-space:normal;flex:1 1 0;text-align:start;padding:12px 10px 10px;font-size:14px} }

/* who — tags */
.who-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--rule-strong);border-inline-start:1px solid var(--rule-strong)}
.who-grid li{position:relative;padding:14px 18px 22px;border-bottom:1px solid var(--rule-strong);border-inline-end:1px solid var(--rule-strong);font-family:var(--f-display);font-weight:700;font-size:clamp(17px,1.5vw,21px);line-height:1.2;display:flex;flex-direction:column;gap:6px;min-width:0;transition:background .25s}
.who-grid li:hover{background:var(--paper-2)}
.who-icon{width:100%;height:120px;display:block;margin-bottom:4px}
.who-n{font-family:var(--f-mono);font-size:11px;font-weight:500;color:var(--gold-deep)}
.no-js .who-icon{display:none}
@media (max-width:900px){ .who-grid{grid-template-columns:repeat(2,1fr)} }

/* ---------- join: the title block form ---------- */
.join{background:var(--join-bg);color:var(--cream);background-image:
  linear-gradient(rgba(247,243,236,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(247,243,236,.04) 1px,transparent 1px);
  background-size:24px 24px}
.join h2{color:var(--cream)}
.join .eyebrow{color:var(--gold)}
.join .lede{color:rgba(247,243,236,.78)}
.join-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(28px,5vw,72px);align-items:start}
.join-aside{display:grid;gap:22px;max-width:760px}
.join-aside .join-logo{width:200px;height:auto;opacity:.92;margin-top:8px}
.tb{border:1.5px solid rgba(247,243,236,.55);display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
.cell{position:relative;border-inline-end:1px solid rgba(247,243,236,.22);border-bottom:1px solid rgba(247,243,236,.22);padding:10px 14px 8px;min-width:0;display:flex;flex-direction:column}
.cell:nth-child(2n){border-inline-end:0}
.cell.full{grid-column:1/-1;border-inline-end:0}
.cell label,.cell legend,.cell .lbl{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--gold-hi);padding:0;margin-bottom:4px;display:block}
html[lang=ar] .cell label,html[lang=ar] .cell legend,html[lang=ar] .cell .lbl,
html[lang=zh-Hans] .cell label,html[lang=zh-Hans] .cell legend,html[lang=zh-Hans] .cell .lbl{letter-spacing:0;text-transform:none;font-size:13px}
.cell .opt{color:rgba(247,243,236,.5);text-transform:none;letter-spacing:0;font-family:var(--f-body)}
.cell .req{color:var(--gold)}
.cell input,.cell select,.cell textarea{
  appearance:none;width:100%;background:transparent;border:0;color:var(--cream);font:500 17px/1.4 var(--f-body);padding:4px 0 6px;outline:none;border-radius:0;
}
.cell select{background-image:linear-gradient(45deg,transparent 50%,var(--gold) 50%),linear-gradient(135deg,var(--gold) 50%,transparent 50%);background-position:calc(100% - 12px) 55%,calc(100% - 7px) 55%;background-size:5px 5px;background-repeat:no-repeat;padding-inline-end:24px}
[dir=rtl] .cell select{background-position:12px 55%,17px 55%}
.cell select option{color:var(--navy);background:var(--cream)}
.cell textarea{resize:vertical;min-height:72px}
.cell input::placeholder,.cell textarea::placeholder{color:rgba(247,243,236,.38)}
.cell:focus-within{background:rgba(247,243,236,.05)}
.cell:focus-within::after{content:"";position:absolute;inset-inline:0;bottom:-1px;height:2px;background:var(--gold)}
.cell.bad{background:rgba(163,53,43,.16)}
.cell .msg{font-size:13px;color:#F2B8AE;min-height:0}
.cell input[dir=ltr]{text-align:start}
[dir=rtl] .cell input[type=tel],[dir=rtl] .cell input[type=email]{direction:ltr;text-align:right}
fieldset.cell{margin:0;min-inline-size:0}
.seg{display:flex;gap:8px;flex-wrap:wrap;padding:4px 0 6px}
.seg label{font:600 15px/1 var(--f-body);letter-spacing:0;text-transform:none;color:var(--cream);margin:0;cursor:pointer}
.seg label,.chips label{position:relative}
.seg input,.chips input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;pointer-events:none}
.seg span{display:inline-flex;align-items:center;min-height:40px;padding:0 16px;border:1.5px solid rgba(247,243,236,.45)}
.seg input:checked + span{background:var(--gold);border-color:var(--gold);color:var(--navy)}
.seg input:focus-visible + span{outline:2px solid var(--gold-hi);outline-offset:2px}
.chips{display:flex;flex-wrap:wrap;gap:6px;padding:4px 0 8px}
.chips label{margin:0;cursor:pointer;font:500 14px/1.2 var(--f-body);letter-spacing:0;text-transform:none;color:var(--cream)}
.chips span{display:inline-flex;align-items:center;gap:6px;min-height:34px;padding:0 12px;border:1px solid rgba(247,243,236,.32)}
.chips input:checked + span{background:rgba(203,165,96,.22);border-color:var(--gold);color:var(--gold-hi)}
.chips input:checked + span::before{content:"✓";font-size:12px}
.chips input:focus-visible + span{outline:2px solid var(--gold-hi);outline-offset:2px}
.consent{display:grid;gap:12px;padding:16px 0 4px}
.check{display:flex;gap:12px;align-items:flex-start;font-size:15px;color:rgba(247,243,236,.9);cursor:pointer}
.check input{appearance:none;flex:0 0 auto;width:20px;height:20px;margin:2px 0 0;border:1.5px solid rgba(247,243,236,.6);display:grid;place-content:center;cursor:pointer}
.check input:checked{background:var(--gold);border-color:var(--gold)}
.check input:checked::after{content:"";width:10px;height:6px;border-inline-start:2px solid var(--ink);border-bottom:2px solid var(--navy);transform:translateY(-1px) rotate(-45deg)}
.check a{color:var(--gold-hi)}
.check.bad{color:#F2B8AE}
.submit-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:18px}
.form-msg{font-size:14.5px;margin:0}
.form-msg.err{color:#F2B8AE}
.form-msg.info{color:var(--gold-hi)}
.hp{position:absolute!important;inset-inline-start:-9999px;width:1px;height:1px;overflow:hidden}
.done{border:1.5px solid var(--gold);padding:clamp(24px,4vw,44px);display:grid;gap:14px}
.done h3{color:var(--cream);font-size:clamp(24px,2.4vw,32px)}
.done p{margin:0;color:rgba(247,243,236,.82)}
.preview-payload{margin:6px 0 0;font:12px/1.5 var(--f-mono);direction:ltr;text-align:left;background:rgba(0,0,0,.25);padding:12px;max-height:240px;overflow:auto;white-space:pre-wrap;color:rgba(247,243,236,.85)}
@media (max-width:900px){
  .join-grid{grid-template-columns:1fr}
  .join-aside{position:static}
  .join-aside .join-logo{display:none}
}
@media (max-width:560px){
  .tb{grid-template-columns:1fr}
  .cell{border-inline-end:0}
}

/* FAQ */
.faq{max-width:900px}
.faq details{border-bottom:1px solid var(--rule)}
.faq details:first-of-type{border-top:1.5px solid var(--ink)}
.faq summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;gap:20px;align-items:center;padding:22px 0;font-family:var(--f-display);font-weight:700;font-size:clamp(18px,1.6vw,22px);line-height:1.3}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";flex:0 0 auto;width:14px;height:14px;background:
  linear-gradient(var(--ink),var(--ink)) center/14px 2px no-repeat,linear-gradient(var(--ink),var(--ink)) center/2px 14px no-repeat;transition:transform .25s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin:0 0 24px;max-width:66ch;color:var(--ink-2)}

/* footer: drawing title block */
.foot{border-top:1.5px solid var(--ink);margin-top:clamp(40px,6vw,80px)}
.foot-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;border-inline-start:1px solid var(--rule)}
.foot-grid > div{padding:22px 20px;border-inline-end:1px solid var(--rule);border-bottom:1px solid var(--rule);min-width:0;font-size:14.5px}
.foot-grid .k{display:block;font-family:var(--f-mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:8px}
html[lang=ar] .foot-grid .k,html[lang=zh-Hans] .foot-grid .k{letter-spacing:0;text-transform:none;font-size:12.5px}
.foot-grid img{width:190px;height:auto}
.foot-grid a{text-decoration:none;border-bottom:1px solid var(--rule-strong)}
.foot-grid a:hover{border-color:var(--gold)}
.foot-base{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:16px 0 28px;font-size:13px;color:var(--ink-soft)}
.foot-base a{color:inherit}
@media (max-width:860px){ .foot-grid{grid-template-columns:1fr 1fr} }
@media (max-width:520px){ .foot-grid{grid-template-columns:1fr} }

/* ---------- terms page ---------- */
.doc{padding-top:calc(var(--head-h) + clamp(40px,6vw,80px));padding-bottom:40px}
.doc-grid{display:grid;grid-template-columns:240px minmax(0,1fr);gap:clamp(28px,5vw,72px);align-items:start}
.doc-toc{position:sticky;top:calc(var(--head-h) + 24px);font-size:14px}
.doc-toc ol{margin:10px 0 0;padding-inline-start:20px;display:grid;gap:6px;color:var(--ink-2)}
.doc-toc a{text-decoration:none}
.doc-toc a:hover{text-decoration:underline}
.doc-body{max-width:72ch}
.doc-body h1{font-size:clamp(36px,4.6vw,64px)}
.doc-meta{font-family:var(--f-mono);font-size:12px;color:var(--ink-soft);margin:14px 0 36px;letter-spacing:.06em}
.doc-body section{padding:26px 0;border-top:1px solid var(--rule)}
.doc-body h2{font-size:clamp(22px,2vw,28px);margin-bottom:10px}
.doc-body h3{font-size:17px;margin:20px 0 4px;font-family:var(--f-body);font-weight:600;font-stretch:100%}
.doc-body p{margin:8px 0;color:var(--ink-2)}
.doc-body ul{margin:8px 0;padding-inline-start:22px;color:var(--ink-2)}
.doc-body li{margin:4px 0}
.doc-body .n{font-family:var(--f-mono);font-size:12px;color:var(--gold-deep);margin-inline-end:10px}
@media (max-width:860px){ .doc-grid{grid-template-columns:1fr} .doc-toc{position:static} }

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
}


/* ---------- material ticker ---------- */
.ticker{background:var(--band-bg);color:var(--band-fg);overflow:hidden;border-block:1px solid var(--rule-strong);position:relative;z-index:4}
.ticker-track{display:flex;width:max-content;animation:tick 60s linear infinite}
.ticker:hover .ticker-track{animation-play-state:paused}
[dir=rtl] .ticker-track{animation-name:tick-rtl}
.ticker ul{display:flex;list-style:none;margin:0;padding:0}
.ticker li{display:flex;align-items:center;gap:28px;padding:18px 0 18px 28px;font-family:var(--f-display);font-weight:800;font-stretch:112%;font-size:clamp(18px,1.8vw,26px);white-space:nowrap;text-transform:uppercase;letter-spacing:.02em}
[dir=rtl] .ticker li{padding:18px 28px 18px 0}
html[lang=ar] .ticker li,html[lang=zh-Hans] .ticker li{text-transform:none;letter-spacing:0}
.ticker li::after{content:"";width:9px;height:9px;background:currentColor;transform:rotate(45deg);opacity:.7}
@keyframes tick{to{transform:translateX(-50%)}}
@keyframes tick-rtl{to{transform:translateX(50%)}}

/* ---------- figures ---------- */
.figs{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--rule);padding-block:0}
.fig{padding:34px 20px 30px;border-inline-end:1px solid var(--rule);display:grid;gap:4px;min-width:0}
.fig:last-child{border-inline-end:0}
.fig-n{font-family:"Archivo",var(--f-display);font-weight:800;font-stretch:112%;font-size:clamp(44px,5vw,72px);line-height:1;color:var(--gold-deep);font-variant-numeric:tabular-nums}
.fig-l{font-size:15px;color:var(--ink-2)}
@media (max-width:760px){ .figs{grid-template-columns:1fr 1fr} .fig:nth-child(2){border-inline-end:0} .fig:nth-child(-n+2){border-bottom:1px solid var(--rule)} }

/* ---------- diagrams (what changes) ---------- */
.dg{margin:0 0 6px}
.diagram{width:100%;height:auto;display:block;overflow:visible}
.dg figcaption{font-size:14px;color:var(--ink-soft);margin:6px 0 4px}
.with .dg figcaption{color:var(--ink-2)}
.diagram .lbl{font-family:var(--f-body);font-size:13px;font-weight:600;fill:var(--ink)}
.diagram .lbl.dim{fill:var(--ink-soft);font-weight:500;font-size:12px}
.diagram .hub-l{fill:var(--gold-deep);font-family:"IBM Plex Sans",sans-serif}
.diagram .node-you{fill:var(--paper);stroke:var(--ink);stroke-width:1.6}
.diagram .node-sup{fill:var(--paper);stroke:var(--ink-soft);stroke-width:1.3}
.diagram .node-ok{fill:var(--ink-2);stroke:var(--ink);stroke-width:1}
.diagram .tick{fill:none;stroke:var(--paper);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.diagram .tangle{fill:none;stroke:var(--ink-soft);stroke-width:1.2;stroke-dasharray:5 6;opacity:.8;animation:march 3.2s linear infinite}
.diagram .ring{fill:none;stroke:var(--err);stroke-width:1.4;opacity:0;animation:ring 2.4s ease-out infinite}
.diagram .link{fill:none;stroke:var(--ink-2);stroke-width:1.3}
.diagram .hub{fill:var(--gold);stroke:var(--navy);stroke-width:1.2}
.diagram .pulse{fill:var(--gold);stroke:var(--navy);stroke-width:.8}
@keyframes march{to{stroke-dashoffset:-110}}
@keyframes ring{0%{opacity:0}20%{opacity:.9}100%{opacity:0}}

/* ---------- reveals ---------- */
[data-reveal]{transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
[data-reveal].pre{opacity:0;transform:translateY(22px)}
html.theme-anim body,html.theme-anim .site-head,html.theme-anim .join,html.theme-anim .ticker{transition:background-color .4s,color .4s}

@media (prefers-reduced-motion:reduce){
  .ticker-track{animation:none}
  [data-reveal].pre{opacity:1;transform:none}
}


/* ---------- registration: two doors, two separate forms ---------- */
.doors{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:6px}
@media (max-width:700px){.doors{grid-template-columns:1fr}}
.door{text-decoration:none;text-align:start;cursor:pointer;display:grid;grid-template-columns:1fr auto;gap:2px 14px;align-items:center;
  padding:16px 18px;background:transparent;color:var(--cream);border:1.5px solid rgba(247,243,236,.35);font:inherit;transition:border-color .2s,background .2s}
.door:hover{border-color:var(--gold)}
.door[aria-selected=true]{background:var(--gold);border-color:var(--gold);color:var(--navy)}
.door-t{font-family:var(--f-display);font-weight:800;font-size:20px;line-height:1.2;grid-column:1}
.door-d{font-size:14px;opacity:.78;grid-column:1}
.door .arr{grid-column:2;grid-row:1/3;font-size:20px;transition:transform .2s}
.door:hover .arr{transform:translateX(4px)}
[dir=rtl] .door .arr{transform:scaleX(-1)}
[dir=rtl] .door:hover .arr{transform:scaleX(-1) translateX(4px)}
.regs{min-width:0}
.reg + .reg{margin-top:40px}
.js .has-doors .reg + .reg{margin-top:0}
.reg-head{margin-bottom:18px}
.reg-head h3{color:var(--cream);font-size:clamp(24px,2.4vw,32px)}
.reg-head p{margin:6px 0 0;color:rgba(247,243,236,.75);font-size:15px}
.grp{font-family:var(--f-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin:22px 0 8px;display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px}
.grp-hint{font-family:var(--f-body);letter-spacing:0;text-transform:none;font-size:13px;color:rgba(247,243,236,.6)}
html[lang=ar] .grp,html[lang=zh-Hans] .grp{letter-spacing:0;text-transform:none;font-size:14px}
.regs-empty{border:1.5px dashed rgba(247,243,236,.3);padding:40px 28px;color:rgba(247,243,236,.8);font-size:17px;display:none}
.regs-empty .arr{display:inline-block;color:var(--gold);margin-inline-end:8px}
[dir=rtl] .regs-empty .arr{transform:scaleX(-1)}
@media (max-width:900px){ .regs-empty .arr{transform:rotate(90deg)} [dir=rtl] .regs-empty .arr{transform:rotate(90deg)} }
.js .has-doors .regs:not(:has(.reg:not([hidden]))) .regs-empty{display:block}

/* document rows */
.docs{list-style:none;margin:0;padding:0;border:1.5px solid rgba(247,243,236,.55)}
.doc{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px 16px;align-items:center;padding:12px 14px;border-bottom:1px solid rgba(247,243,236,.22)}
.doc:last-child{border-bottom:0}
.doc-l{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 10px;min-width:0}
.doc-n{font-weight:600;font-size:15px;color:var(--cream)}
.doc-req{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--navy);background:var(--gold);padding:2px 6px}
html[lang=ar] .doc-req,html[lang=zh-Hans] .doc-req{letter-spacing:0;font-size:12px}
.doc .opt{font-size:13px;color:rgba(247,243,236,.5)}
.doc-file{flex-basis:100%;font-size:13px;color:var(--gold-hi);overflow-wrap:anywhere}
.doc-file:empty{display:none}
.doc .msg{flex-basis:100%;font-size:13px;color:#F2B8AE}
.doc .msg:empty{display:none}
.doc-a{display:flex;gap:8px;align-items:center}
.doc-pick{position:relative;cursor:pointer}
.doc-pick input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}
.doc-pick-t{display:inline-flex;align-items:center;gap:8px;min-height:38px;padding:0 14px;border:1.5px solid rgba(247,243,236,.5);color:var(--cream);font:600 14px/1 var(--f-body);white-space:nowrap}
.doc-pick-t::before{content:"";width:12px;height:12px;background:
  linear-gradient(currentColor,currentColor) center/12px 1.6px no-repeat,linear-gradient(currentColor,currentColor) center/1.6px 12px no-repeat}
.doc.has .doc-pick-t::before{background:none;width:10px;height:6px;border-inline-start:2px solid currentColor;border-bottom:2px solid currentColor;transform:translateY(-2px) rotate(-45deg)}
.doc.has .doc-pick-t{border-color:var(--gold);color:var(--gold-hi)}
.doc-pick:focus-within .doc-pick-t{outline:2px solid var(--gold-hi);outline-offset:2px}
.doc-pick:hover .doc-pick-t{border-color:var(--gold)}
.doc-x{appearance:none;background:none;border:0;color:rgba(247,243,236,.7);font:500 13px/1 var(--f-body);text-decoration:underline;cursor:pointer;padding:8px 4px}
.doc.bad{background:rgba(163,53,43,.16)}
@media (max-width:560px){ .doc{grid-template-columns:1fr} }